so i have a temporary 6 gal tank for 2 of my males. i bought a 25 watt heater that said it would heat up to 6.6 gallons to 78*. well it lied. it's only been heating up to 70. it's a preset heater, which i hate, but i was afraid if i got anything stronger that it would be much for them.
if anyone knows of a good heater for that size it would be much appreciated!
I have 50w heaters in my 2.5g tanks. Overkill? yes, but they're adjustable and work fantastic during the colder months. I suggest grabbing a 50w adjustable. hagen makes them that are fairly inexpensive. Petsuppliesplus has them, or you can grab them off of amazon.com
There are advantages and disadvantages of using a larger adjustable heater than a small adjustable heater. A 50w heater will cycle on/off less often, thereby extending the life of the heater. Because they are usually longer, there is more water contact, allowing it to more evenly heat up the water. It can also deal with colder temps much easier than a smaller heater can.